<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>响应式布局基础</title>
    <link rel="stylesheet" href="CSS/normalize.css">
    <link rel="stylesheet" href="CSS/layout4.css">

</head>
<body>
<div class="main">
    <div class="header">
        <h1>
            响应式设计
        </h1>
    </div>
<div class="main">
    <div class="sidebar">
        <p>侧边栏</p>
    </div>
    <div class="content">
        <p>内容区域</p>
    </div>
</div>
    <div class="footer">
        <address>页脚</address>
    </div>
</div>

</body>
</html>